/*
 * This file contains code from "C++ Primer, Fifth Edition", by Stanley B.
 * Lippman, Josee Lajoie, and Barbara E. Moo, and is covered under the
 * copyright and warranty notices given in that book:
 * 
 * "Copyright (c) 2013 by Objectwrite, Inc., Josee Lajoie, and Barbara E. Moo."
 * 
 * 
 * "The authors and publisher have taken care in the preparation of this book,
 * but make no expressed or implied warranty of any kind and assume no
 * responsibility for errors or omissions. No liability is assumed for
 * incidental or consequential damages in connection with or arising out of the
 * use of the information or programs contained herein."
 * 
 * Permission is granted for this code to be used for educational purposes in
 * association with the book, given proper citation if and when posted or
 * reproduced.Any commercial use of this code requires the explicit written
 * permission of the publisher, Addison-Wesley Professional, a division of
 * Pearson Education, Inc. Send your request for permission, stating clearly
 * what code you would like to use, and in what specific way, to the following
 * address: 
 * 
 * 	Pearson Education, Inc.
 * 	Rights and Permissions Department
 * 	One Lake Street
 * 	Upper Saddle River, NJ  07458
 * 	Fax: (201) 236-3290
*/ 

#include <iostream>
using std::cout; using std::endl;

// namespace A and function f are defined at global scope
namespace A {
    int i = 0, j = 42;
}

void f() 
{
    using namespace A; // injects the names from A into the global scope

	// uses i and j from namespace A
    cout << "i: " << i << " j: " << j << endl;
}

namespace blip {
    int i = 16, j = 15, k = 23;
	void f() 
		{ cout << "i: " << i << " j: " << j << " k: " << k << endl; }
}

int j = 0;  // ok: j inside blip is hidden inside a namespace

int main() 
{
    // using directive; 
	// the names in blip are ``added'' to the global scope
    using namespace blip; // clash between ::j and blip::j
                          // detected only if j is used

    ++i;        // sets blip::i to 17
    ++::j;      // ok: sets global j to 1
    ++blip::j;  // ok: sets blip::j to 16

    int k = 97; // local k hides blip::k
    ++k;        // sets local k to 98

	::f();        
	blip::f();
	cout << "j: " << ::j << " k: " << k << endl; 

	return 0;
}
